DER30053 - AC Electrification Systems (Chapter 2)

What is the main function of a traction transformer?

• To convert AC to DC

• To step down the voltage for train traction

• To regulate train speed

• To control the current flow

What is the primary difference between a traction transformer and an auto transformer?

• Traction transformers are used in automobiles.

• Auto transformers have a single winding.

• Traction transformers can work without any insulation.

• Auto transformers are used in higher frequency applications.

Which of the following describes a vacuum circuit breaker?

• Uses air as the arc quenching medium

• Uses SF6 gas as the arc quenching medium

• Uses a vacuum as the arc quenching medium

• Uses oil as the arc quenching medium

What is the function of a changeover switch?

• To switch between two electrical sources

• To change the direction of current flow

• To increase the voltage level

• To reduce the frequency of the supply

Which type of switchgear uses an insulating gas as a medium?

• Air Insulated Switchgear

• Oil Insulated Switchgear

• Solid Insulated Switchgear

• Gas Insulated Switchgear

How does a vacuum circuit breaker extinguish an arc?

• By cooling the arc

• By absorbing the arc in a vacuum

• By quenching the arc in oil

• By displacing the arc with air

Which of the following is a characteristic of a traction transformer?

• It is only used in power plants.

• It is used to step up voltage.

• It has multiple windings.

• It is specifically designed for railway systems.

What is the main advantage of gas insulated switchgear over air insulated switchgear?

• It is cheaper to manufacture.

• It requires less maintenance.

• It has a longer lifespan.

• It is easier to install.

What role does the control and relay panel play in AC electrification systems?

• It provides backup power.

• It manages the operation of circuit breakers.

• It supplies high voltage to the system.

• It acts as a conductor for the power supply.

Which component is most likely to be found in an AC feeding protection relay?

• Capacitor

• Resistor

• Relay contacts

• Battery